I can attest to the quality of the glasses. Usually I buy from zenni but these where remarkably better than thiers. The styles are nicer here too, I was looking for a nice pair of wayfare glasses on zenni but they didn't have much, here I found many I liked. You can find clearance glasses from $9.99, or $19.99 not on sale. Sometimes there are sales for buy ome get one free which comes out to a great deal.
One thing to make sure about is that these glasses have little extra designs on them, just take a good look at the glasses before you buy them to make sure there are none of these little designs that you womt like.